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------------------------------------------------------------------------------
-- geoelf_directions.lua:
--
-- Contains the direction constants used by the geoelf layout
-- generator. Corridors are all in one of these directions,
-- and a room can have at most one corridor leaving it per
-- direction.
------------------------------------------------------------------------------
geoelf.directions = {} -- Namespace for direction constants, etc.
--
-- The number of directions
--
geoelf.directions.COUNT = 8
geoelf.directions.COUNT_STRAIGHT = 4
--
-- The possible directions
--
geoelf.directions.S = 0
geoelf.directions.N = 1
geoelf.directions.E = 2
geoelf.directions.W = 3
geoelf.directions.SE = 4
geoelf.directions.NW = 5
geoelf.directions.SW = 6
geoelf.directions.NE = 7
--
-- There are two possible direction values that can describe
-- each corridor, depending on which way along it you are
-- going. To avoid redundancy, we declare one of each
-- direction pair to be forwards and one to be backwards. We
-- will reverse the backwards corridors before drawing them.
--
-- We are using lookup arrays here instead of functions for
-- speed reasons.
--
-- Note that the direction values are being used as the indexes
-- here, not the names.
--
geoelf.directions.IS_REVERSE =
{ [geoelf.directions.S] = false,
[geoelf.directions.N] = true,
[geoelf.directions.E] = false,
[geoelf.directions.W] = true,
[geoelf.directions.SE] = false,
[geoelf.directions.NW] = true,
[geoelf.directions.SW] = false,
[geoelf.directions.NE] = true }
geoelf.directions.GET_REVERSE =
{ [geoelf.directions.S] = geoelf.directions.N,
[geoelf.directions.N] = geoelf.directions.S,
[geoelf.directions.E] = geoelf.directions.W,
[geoelf.directions.W] = geoelf.directions.E,
[geoelf.directions.SE] = geoelf.directions.NW,
[geoelf.directions.NW] = geoelf.directions.SE,
[geoelf.directions.SW] = geoelf.directions.NE,
[geoelf.directions.NE] = geoelf.directions.SW }
--
-- Moving along any straight directions involve repeatedly
-- either increasing or decreasing the component of the
-- position. This can be seen as either adding 1 or -1.
--
geoelf.directions.STEP_SIGN =
{ [geoelf.directions.S] = 1,
[geoelf.directions.N] = -1,
[geoelf.directions.E] = 1,
[geoelf.directions.W] = -1 }
--
-- Each diagonal direction is a combination of 2 straight
-- directions.
--
geoelf.directions.COMPONENT_X =
{ [geoelf.directions.SE] = geoelf.directions.E,
[geoelf.directions.NW] = geoelf.directions.W,
[geoelf.directions.SW] = geoelf.directions.W,
[geoelf.directions.NE] = geoelf.directions.E }
geoelf.directions.COMPONENT_Y =
{ [geoelf.directions.SE] = geoelf.directions.S,
[geoelf.directions.NW] = geoelf.directions.N,
[geoelf.directions.SW] = geoelf.directions.S,
[geoelf.directions.NE] = geoelf.directions.N }
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